Phone seems to report multiple models?

Okay so helping a friend update their phone (US bought straight from carrier), as the carrier (Viaero wireless) isn't providing any updates for the Galaxy S5 past Android 4.4.2. I understand that i'll have to flash it with new stock firmware and there's no way to get OTA updates to work in the future, doesn't seem to be anyway around that. However the phone is a bit of a mishmash of the G900T and G900M, so I'm not sure how to go about flashing it without bricking it. I have been told elsewhere that all these models are interchangeable and flashing between builds from each one is no issue however I have read elsewhere that doing so will brick your phone.

The build details are as follows:
AP: G900MUBU1AUMS
CP: G900TUVU1ANCH
CSC: G900MUUB1ANCE
Product Code: SM2G900TZKAATT (at&t build?)

via xda-developers http://ift.tt/1seEklL

Put the internet to work for you.

Turn off or edit this Recipe